Journal of Nematology (2005) 37, p. 374 (Ingham et al.)

R.E. Ingham, N.L. David, N.M. Wade and K.J. Merrifield (2005)
The effect of potato variety on Columbia root-knot nematode (Meloidogyne chitwoodi) population dynamics
Journal of Nematology 37 (3), 374-374
44th Annual Meeting, Society of Nematologists, Fort Lauderdale, Florida, 9-13 July, 2005
Abstract: Columbia root-knot nematode (Meloidogyne chitwoodi, CRKN) is a serious pathogen of potato (Solanum tuberosum) in many areas of the western United States. Research on the epidemiology of CRKN on potato has been conducted primarily on Russet Burbank, but little is known on other varieties. Previous research has indicated that the first generation of CRKN invades potato roots soon after they are present, and the second generation hatches from roots between 940 and 1000 soil degree-days base 5C (DD_5C) after planting. Based on these results, in-season nematicide programs to control CRKN with oxamyl have begun at 950 DD_5C after planting. Trials at Hermiston, Oregon were established to study CRKN population dynamics on five popular potato varieties grown in the western United States. Alturas, Ranger Russet, Russet Burbank, Russet Norkotah, and Yukon Gold were planted on 12 April, 2004 in a field infested with CRKN. Soil was sampled weekly from planting until 14 September. Regardless of cultivar grown, soil populations of CRKN declined rapidly after planting, and the second generation of CRKN began hatching from potato roots (indicated by rapid increase in J2 recovered from soil) between 900 and 1 000 DD_5C after planting. This suggests that timing of nematicide applications based on CRKN population dynamics would be the same for all varieties tested. When population dynamics were evaluated based on density of CRKN at planting, second generation J2 were recovered from soil earlier when initial populations were high than when initial populations were low. These results suggest that in-season nematicide applications should begin earlier when initial CRKN densities are high.
Database assignments for author(s): Russell E. Ingham

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology
control - general

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Meloidogyne chitwoodi	Potato (Solanum tuberosum)	U.S.A. (NW)